WO2010069911A1 - Pressostat électromécanique à système d'amplification à levier de démultiplication - Google Patents

Pressostat électromécanique à système d'amplification à levier de démultiplication Download PDF

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Publication number
WO2010069911A1
WO2010069911A1 PCT/EP2009/067063 EP2009067063W WO2010069911A1 WO 2010069911 A1 WO2010069911 A1 WO 2010069911A1 EP 2009067063 W EP2009067063 W EP 2009067063W WO 2010069911 A1 WO2010069911 A1 WO 2010069911A1
Authority
WO
WIPO (PCT)
Prior art keywords
lever
pressure switch
bend
membrane
switch according
Prior art date
Application number
PCT/EP2009/067063
Other languages
English (en)
Inventor
Marco Gerolamo Omati
Ennio Omati
Original Assignee
Ma-Ter S.R.L.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ma-Ter S.R.L. filed Critical Ma-Ter S.R.L.
Priority to EP09797008.1A priority Critical patent/EP2377137B1/fr
Priority to CN200980150580.XA priority patent/CN102171781B/zh
Publication of WO2010069911A1 publication Critical patent/WO2010069911A1/fr
Priority to HK12101277A priority patent/HK1160983A1/xx

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/26—Details
    • H01H35/2607—Means for adjustment of "ON" or "OFF" operating pressure
    • H01H35/2635—Means for adjustment of "ON" or "OFF" operating pressure by adjustment of a motion transmitting system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/32—Driving mechanisms, i.e. for transmitting driving force to the contacts
    • H01H3/46—Driving mechanisms, i.e. for transmitting driving force to the contacts using rod or lever linkage, e.g. toggle
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/34—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm

Definitions

  • the present invention relates to an electromechanical pressure switch which may be used to check the pressure within an apparatus.
  • Electromechanical pressure switches are known, in which the sensed pressure is translated into a movement of a sensitive elastic membrane element, which actuates an electric switching system constructed and directly accommodated within the body of the pressure switch by means of a lever system which amplifies and transmits the electric signal originated by such a movement.
  • the pressure switch according to the present invention is characterized in that it includes an external microswitch and in that it contains a "disadvantageous", third-kind lever therein, which allows to amplify the even limited movement of a sensitive membrane element according to a specific ratio which may be changed according to the final application needs of the pressure switch.
  • the pressure switch according to the invention allows to use a membrane made of any material, such as stainless steel, copper, beryllium, carbon steel, etc., in addition to being designed and developed with relatively high thickness so as to withstand repeated mechanical stresses and high overpressures without being subjected to permanent deformations, because even the minimum movement of the same is amplified by the "disadvantageous" lever system.
  • the construction simplicity makes the device particularly cost-effective, simple to be assembled and produced, because the materials used for its implementation are not high-tech materials and the mechanical tolerances are relatively high.
  • figure 1 shows an embodiment of the pressure switch according to the invention in a vertical section taken along I- 1 line in figure 2; figure 2 shows the same pressure switch horizontally sectioned along line II- II in figure 1 ; figure 3 shows the pressure switch in figure 1, seen from the bottom and partially sectioned; figure 4 shows a variant of the pressure switch in figure 1 ; figure 5 shows another variant of the pressure switch in figure 1 ; figure 6 shows a further variant of the pressure switch according to the present invention; figure 7 shows a third-kind lever engaged in the pressure switch in figure 6.
  • the pressure switch shown in figures 1, 2 and 3 comprises a lower base 1 provided with a threaded fitting 2 longitudinally crossed by an axial hole 3 which puts the controlled apparatus into communication with a pressure sensing chamber 4 which is closed by an elastic membrane 5.
  • Two appropriately dimensioned annular seals 6 and 7 ensure the tightness between the threaded fitting 2 and the base 1 and between the elastic membrane 5 and the base 1.
  • An elastic ring 8 is placed at the end of the fitting 2 inside chamber 4 to allow the upper part of the pressure switch to rotate and be manually positioned in the most suitable position for the application without using tools.
  • Membrane 5 is kept in a firm position between the base 1 and an upper cap 9 by mechanically seaming a clip 10.
  • the lower base 1 and the upper cap 9 form a hollow body forming the outer case of the pressure switch.
  • the elastic membrane 5 may be made of any material, such as stainless steel, copper, beryllium, carbon steel, etc. and be designed and developed with relatively high thickness to withstand repeated mechanical stresses and high overpressures without being subjected to permanent deformations.
  • lever 15 is made in one piece formed by a first end bend 16, a second bend 17 and a first flat part 18.
  • the first bend 16 is clamped between the lower base 1 and the upper cap 9 at a side edge portion of membrane 5.
  • the second bend 17 is placed under fixed walls 19 of the cap 9, either in contact therewith (figures 1-3 and 4) or spaced therefrom (figure 5) depending on the shape of the lever, as will be explained below.
  • the flat part 18 on which the screw 13 is screwed has underlying stiffening ribs 20 and bears a vertically projecting tip 21 at its free end, which is intended to actuate a push button 22 of the switchable microswitch 23 firmly fixed outside the cap 9, and thus outside the pressure switch body, by means of screws 24.
  • a compression spring 25 is positioned between the head of the adjusting screw 13 and the flat part 18 of the lever 15 to avoid vibrations or non-axial efforts from changing the position of the screw 13, thus compromising the adjustment of the pressure switch.
  • Lever 15 is made of elastic materials, such as appropriately treated carbon steel or stainless steel, so as to exploit the mechanical feature of elasticity of the material of which it is made and keep the tip of the adjusting screw 13 constantly in contact with the membrane 5.
  • the operating principle of the pressure switch in object is as follows.
  • a pressurized fluid enters into the sensing chamber 4 through the inlet hole 3 of the threaded fitting 2 and causes the deformation of the membrane 5 in a direction according to the inlet direction of the fluid.
  • Membrane 5 transmits its movement to the spherical tip 12 of the screw 13 and thus to the central zone of the lever 15, withheld in position at one end by means of the bend 16 clamped between the base 1 and the cap 9.
  • lever 15 has the bend 17 resting on the cap 9 at the fixed walls 19 of the cap itself. This contact between the bend 17 the lever 15 and the walls 19 of cap 9 determines the fulcrum about which the lever 15 rotates to transmit and amplify the vertical movement generated by the movement of membrane 4. Because the power arm of the lever 15 is shorter than the resisting arm of the lever itself, a high sensing sensitivity of the fluid pressure is obtained.
  • the lever 15 is made of elastic materials, such as appropriately treated carbon steel or stainless steel, so as to exploit the mechanical feature of elasticity of the material to keep the tip of the adjusting screw 13 constantly in contact with membrane 5. This contrivance allows to immediately transmit every minimum pressure variation which occurs within the sensing chamber 4.
  • the movement of the lever 15 produced by the deformation of membrane 5 determines the actuation of the actuating push button 22 of the micro switch 23 by the projecting tip 21 placed at the free end of the lever 15 and positioned perpendicularly to the push button 22 of the microswitch 23 to limit the contact surface between the two parts to the minimum and thus reduce frictions and ensure a better repeatability of the electrical intervention.
  • Ribs 20 longitudinally placed along the whole length of the flat part 18 of lever 15 confer a high degree of rigidity to the central part of the lever 15, so as to integrally transmit the movement of membrane 5 without the transmission being fouled by elastic deformations of the lever arm.
  • the entity of the movement of lever 15, with the fluid pressure in chamber 4 being equal, may be adjusted by means of the adjusting screw 13, which can be accessed from the upper part of the pressure switch by means of a hole 26 at the top of the cap 9.
  • the positioning angle of lever 15 with respect to the surface of membrane 5 is increased by screwing the adjusting screw 13 against the membrane 5, because the lever 15 is hinged onto the bend 17 resting on the fixed walls 19.
  • This movement determines the decrease of the adjustment value of the pressure switch, since the actuating tip 21 placed at the end of the lever 15 approaches the push button 22 of microswitch 23 thus requiring a smaller movement of the membrane 5 and therefore a lower fluid pressure for actuating the push button.
  • the adjusting screw 13 instead, the opposite effect is obtained, i.e. the tip 21 of lever 15 moves away from the push button 22 of microswitch 23 thus requiring a greater movement of membrane 5 and a higher fluid pressure to actuate the push button.
  • Lever 15 is kept in position during the step of adjusting by means of guides 27 on the walls 19 of cap 9 at the bend 17 of the lever 15 (figure 3) and, close to tip 21, by means of two guides 28 directly obtained on the cap 9 (figure 1). These guides avoid the adjusting screw 13 from being offset and the lever 15 from twisting at the contact point between the bend 17 and the walls 19, thus conferring more stability and accuracy during the step of adjusting.
  • a slot 29 is present within hole 26 at the upper end of cap 9, adapted to receive a disc or plug 30 herein, made of elastically deformable plastic material, to be applied after the adjustment process by the manufacturer, as a guarantee from possible tampering by the end user. If removed, tampered or perforated, this plug 30 would determine the end of the manufacturer's responsibility about the adjustment of the pressure switch.
  • the difference between the pressures which determine the opening and closing of an electric circuit by means of a switching push button of the microswitch 23 may further be changed, thus modifying the length ratio of power arm and resisting arm of lever 15 with respect to the fulcrum of the lever itself.
  • the minimum ratio condition may be obtained by moving the bend 17 of lever 15 away from the walls 19 of cap 9 (figure 5) so as to remove the contact point between the bend 17 and the walls 19 and thus moving the fulcrum of lever 15 at the end bend 16.
  • the second bend 17 may be lacking and replaced by an inclined plane 31 connecting the first bend 16, acting as a fulcrum, and the flat part 18.
  • the inclined plane 31 preferably includes at least one window or recess 32, capable of favoring the flexion of the lever 15 at the same window or recess, as shown in greater detail in figure 7.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Measuring Fluid Pressure (AREA)

Abstract

L'invention porte sur un pressostat électromécanique comprenant un corps creux formé par une base (1) et une coiffe (9), entre lesquelles une membrane élastiquement déformable (5) est serrée et ferme une chambre de détection de pression (4) qui communique avec un orifice d'admission (3) pour un fluide sous pression, et des moyens à levier (15) pour transmettre la déformation de la membrane (5) provoquée par le fluide sous pression à un bouton poussoir d'actionnement (22) d'un microrupteur commutable (23). Les moyens à levier (15) sont constitués d'un levier de troisième type monobloc (15), comprenant un coude de première extrémité (16) serré conjointement avec ladite membrane (5) entre ladite base (1) et ladite coiffe (9) et une partie plate (18) qui porte à l'extrémité libre une nervure saillante (21) pour commander ledit bouton poussoir d'actionnement (22) du microrupteur (23). La partie plate (18) du levier (15) est fixée de façon ajustable à une vis d'ajustement (13) présentant un axe coïncidant avec celui du pressostat, qui présente une pointe sphérique (12) en contact avec un point central (11) de la membrane (5).
PCT/EP2009/067063 2008-12-18 2009-12-14 Pressostat électromécanique à système d'amplification à levier de démultiplication WO2010069911A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP09797008.1A EP2377137B1 (fr) 2008-12-18 2009-12-14 Pressostat électromécanique à système d'amplification à levier de démultiplication
CN200980150580.XA CN102171781B (zh) 2008-12-18 2009-12-14 具有费力杠杆放大系统的机电压力开关
HK12101277A HK1160983A1 (en) 2008-12-18 2012-02-09 Electromechanical pressure switch with disadvantageous-lever amplification system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2008A002250A IT1392477B1 (it) 2008-12-18 2008-12-18 Pressostato elettromeccanico con sistema di amplificazione a leva svantaggiosa
ITMI2008A002250 2008-12-18

Publications (1)

Publication Number Publication Date
WO2010069911A1 true WO2010069911A1 (fr) 2010-06-24

Family

ID=40851989

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2009/067063 WO2010069911A1 (fr) 2008-12-18 2009-12-14 Pressostat électromécanique à système d'amplification à levier de démultiplication

Country Status (5)

Country Link
EP (1) EP2377137B1 (fr)
CN (1) CN102171781B (fr)
HK (1) HK1160983A1 (fr)
IT (1) IT1392477B1 (fr)
WO (1) WO2010069911A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3279915B1 (fr) * 2016-08-04 2022-11-09 ELBI International S.p.A. Capteur de pression pour fluides

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109243914B (zh) * 2018-09-28 2024-03-29 上海乐研电气有限公司 一种提高气体密度继电器精度的方法及气体密度继电器
JP6966490B2 (ja) * 2019-01-28 2021-11-17 株式会社鷺宮製作所 圧力スイッチ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3239129A1 (de) * 1982-10-22 1984-04-26 H. Kuhnke Elektrotechnik GmbH, 5611 Büttikon Pe-wandler
US5252792A (en) * 1989-05-12 1993-10-12 Eaton Corporation Subassembly for a pressure switch

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2410728Y (zh) * 1999-12-18 2000-12-13 万辉 压力控制开关
ITMI20022761A1 (it) * 2002-12-24 2004-06-25 Ennio Omati Pressostato differenziale

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3239129A1 (de) * 1982-10-22 1984-04-26 H. Kuhnke Elektrotechnik GmbH, 5611 Büttikon Pe-wandler
US5252792A (en) * 1989-05-12 1993-10-12 Eaton Corporation Subassembly for a pressure switch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3279915B1 (fr) * 2016-08-04 2022-11-09 ELBI International S.p.A. Capteur de pression pour fluides

Also Published As

Publication number Publication date
HK1160983A1 (en) 2012-08-17
IT1392477B1 (it) 2012-03-09
EP2377137B1 (fr) 2013-06-19
EP2377137A1 (fr) 2011-10-19
ITMI20082250A1 (it) 2010-06-19
CN102171781B (zh) 2014-06-11
CN102171781A (zh) 2011-08-31

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